1 / 19

PRINCIPLES OF NUCLEAR POWER

INTRODUCTION TO NAVAL ENGINEERING. PRINCIPLES OF NUCLEAR POWER. e -. where: X is the chemical symbol A is the # of protons plus neutrons Z is the # of protons only. A. X. P. Z. BASIC SYMBOLS AND NOTATIONS. Bohr’s Model. EXAMPLE. 235. U. 92. e -. e -. e -. N. P. N.

gyala
Download Presentation

PRINCIPLES OF NUCLEAR POWER

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. INTRODUCTION TO NAVAL ENGINEERING PRINCIPLES OF NUCLEAR POWER

  2. e- where: X is the chemical symbol A is the # of protons plus neutrons Z is the # of protons only A X P Z BASIC SYMBOLS AND NOTATIONS Bohr’s Model EXAMPLE 235 U 92

  3. e- e- e- N P N P P N ISOTOPES TRITIUM HYDROGEN DEUTERIUM

  4. BASIC FISSION EQUATION

  5. 235U+1n 94Zr + 140Ce+ 2 1n 92 92 92 ENERGY RELEASED MASS OF PRODUCTS Zr - 93.90631 amu Ce - 139.90539 amu 2 n - 2(1.00867) amu ------------------------------ TOT: 235.82904 amu MASS OF REACTANTS U - 235.04390 amu n - 1.00867 amu ------------------------------ TOT: 236.95257 mass defect: 236.05257 - 235.82904 = .22353 amu Therefore: Binding Energy = 208.21372 MeV 1 amu = 931.48 MeV where 1 Mev = 1.52x10-15 Btu

  6. TYPES OF NEUTRONS • Fast neutrons • Have KE of .1 MeV • Produced through fission • Very few will cause fission • Slow neutrons • Have KE of 1 eV • Must be slowed by a MODERATOR • Main producer of fission

  7. THE NEUTRON LIFE CYCLE

  8. TERMS RELATED TO REACTIVITY • REACTIVITY- • Critical • Sub-Critical • Super-Critical

  9. UNITED STATES NAVAL REACTORS ARE PRESSURIZED WATER REACTORS

  10. REACTOR CORE & PRESSURE VESSEL

  11. NAVAL REACTOR SAFETY • INHERENT STABILITY • WATER IS BOTH MODERATOR AND COOLANT • POWER GOES UP • TEMP GOES UP • DENSITY GOES DOWN • # THERMALIZED NEUTRONS GOES DOWN • POWER GOES DOWN

  12. PRESSURIZER

  13. RADIATION & SHIELDING • Must protect personnel from the various types of radiation • Alpha particles ( very large, positive) • Beta particles (tiny, negative) • Gamma rays (no mass, no charge) • Neutrons (large, no charge)

  14. SHIELDING

  15. ADVANTAGES OF NUCLEAR POWER Allows for truly submersible weapons platform CVN’s can carry twice the JPF and weapons as a conventional CV Extreme endurance (only limited by food) ALL AHEAD FLANK FOR A YEAR

  16. DISADVANTAGES OF NUCLEAR POWER • Considerable cost of construction/ decommission • Great weight of shielding materials • Environmental concerns • Public Information

  17. FISSION YIELD CURVE The probability that a particular pair of fission fragments will be produced by fission

  18. BINDINGENERGY MOST STABLE ELEMENT (Fe) ENERGY ATOMIC NUMBER

More Related